The TDI Knife was designed by former police lieutenant John Benner, founder of the Tactical Defense Institute, with officers in mind. Drawing on his experiance as an officer and teacher, Benner created the TDI Knife as a "last option" knife.

The TDI Knife was designed by former police lieutenant John Benner, founder of the Tactical Defense Institute, with officers in mind. Drawing on his experiance as an officer and teacher, Benner created the TDI Knife as a "last option" knife.